Perhaps you should try some spelling variations:
"support group integration efforts." » "support group international efforts.", "support group conservation efforts.", "support group interaction efforts.", "support group interactions efforts.", "support erp integration efforts.", "support grant integration efforts."
"supply drop irrigation schemes." » "supply drop irrigation scheme.", "supply drop irrigation systems.", "supply drip irrigation schemes.", "supply crop irrigation schemes.", "supply from irrigation schemes.", "supply europe irrigation schemes.", "supply crowd irrigation schemes."

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply drop irrigation schemes.") OR ("support group integration efforts."))~.
• Removing quotes may allow a broader search: (( supply drop irrigation schemes. ) or ( support group integration efforts. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply drop irrigation schemes.") or ("support group integration efforts."))*.